Investigations of ageing mechanism and electrical withstand performances of the field aged 132 kV PMU Skudai's ceramic post insulator
This thesis presents investigation of 132kV field-aged ceramic post insulator, which has been in service 15 years old on a 132kV in PMU Skudai substation. Insulators are devices which are used in electricity supply networks to support, separate or contain conductors at high voltage. Aging of cera...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/2036/1/24p%20NUR%20ATHIRAH%20THAZALI.pdf http://eprints.uthm.edu.my/2036/2/NUR%20ATHIRAH%20THAZALI%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/2036/3/NUR%20ATHIRAH%20THAZALI%20WATERMARK.pdf |
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| Summary: | This thesis presents investigation of 132kV field-aged ceramic post insulator,
which has been in service 15 years old on a 132kV in PMU Skudai substation.
Insulators are devices which are used in electricity supply networks to support,
separate or contain conductors at high voltage. Aging of ceramic and post
insulator materials is reviewed mainly from the standpoint of their interfacial
performance. Insulating materials can be divided into simple ceramics. Aging
processes are complicated in general, and take place under simultaneous multiple
stresses such as electrical, mechanical and environmental stresses. Contact angle
measured insulation under consideration leads to the surface is approximately
horizontal to the top surface. The sheds also aged differently around their
circumference and this is reflected in discoloration differences on different sides
of the insulator, in addition to hydrophobicity changes. Voltage breakdown
measurements carried out in the laboratory are also presented. Material analysis
shows oxidation of the surface. Ageing effects were different uniform for each
shed, the greatest oxidation being on the top surfaces of the sheds on the west and
east side. Microscopy was found to be the most useful and effective tools for
analysis of these ceramic insulator.
The measurements of the various parameters over the whole surface of the
insulators are found to be consistent with each other and can be interpreted in
terms of the chemistry of ageing and the longer term performance of the specific
insulators in question. Two distinct types of ageing are identified. The role of
solar radiation appears critical. In summary, the post insulators which have been
in service for 15 years have very non-uniform surface properties in both the
vertical and circumferential directions. There are some surface area at insulator
has a moisture contamination at each creepage where found at all direction. |
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